How to fill in the brackets?

1+1+1=3
1+1+3=5
1+3+5=9
3+5+9=17
5+9+17=21
17, 21 in brackets

Find the rules 1, (), (), 7, 15?

You have one more bracket here. It should be the first power of 1 (3) 7 15 2 - the second power of 1 = 1 2 - the third power of 1 = 3 2 - the fourth power of 1 = 7 2 - 1 = 15

9 / 11,3 / 11,1 / 11, (), 1 / 99, () fill in the numbers

The next number is one third of the previous one
Fill in 1 / 33

Find the law 1,1 / 4,1 / 9,1 / 16

General formula: 1 / N & sup2;

RELATED INFORMATIONS

1. Fill in the blanks: 1,1,2,3,7,16,65_ ,4546,……
2. ,13,37,109,（）,（）
3. 16,23,9,30,2, () to find the law needs method
4. 3＋5＋7＋9… ＋（2n－1）＋（2n＋1）＝
5. 1/1*5+1/3*7+1/5*9+.+1/(2n-1)(2n+3)
6. 1+3+5+7… +（2n-1）=______ (denoted by the formula containing N, where n = 1, 2, 3 ．）
7. Calculate 1 / (1 * 3) + 1 / (3 * 5) + 1 / (5 * 7) +... + 1 / (2n-1) * (2n-1) =?
8. In fact, just find the rules A diamond with a side length of 1 and an angle of 60 degrees, whose height is the side of the second diamond, is still a diamond with an angle of 60 degrees?
9. A set of formulas in regular order: The third power of a is the fifth power of B, the third power of a is the eighth power of B, A to the fourth power, B to the eleventh power (AB ≠ 0), where the seventh formula is______ . The nth formula is_______ (n is a positive integer) Change "the third power of a to the fifth power of B" to "the second power of a to the fifth power of B" The first floor is obviously wrong.
10. Find the rule: 27 0 () 0 () The sum is 27, (), () Using quadratic function to solve the problem···
11. Find the rule, 16,3.8,9,4. {}, {}. What's in the brackets
12. Find the law, 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26. The ninth number is Fast
13. 2 / 3,1 has 1 / 3,2,1 has 2 / 3,3 has 1 / 3,4, (), () find the difference between the 100th and 50th numbers
14. Find the rule and add the number 1,8,27,（）,125,216,. There are also 12 / () = 0.75 = 24 / 24 () = (); 4 = ()% as required, so that their greatest common factor is 1 1. Both books are prime numbers; () and () 2. Both books are composite numbers; () and (). 3 are prime numbers and composite numbers; () and ()
15. Find the rule and add the number 3,9,17,19,（
16. Fill in the numbers regularly______ ，12．
17. 1,3,7,13,21,31,43,57,
18. A watermelon, mom ate 3 / 8, dad and I ate 2 / 8 of this watermelon. Has this watermelon finished
19. Xiaoming ate one third of a watermelon, one sixth less than his father. His father ate this watermelon
20. Divide 2 kg into 5 parts on average, each part is a few parts of a kilogram, each part is a few parts of a kilogram, each part is a few parts of a kilogram